Flexible Gas Piping - Evolving Technology & Industry

Transcription

1 Flexible Gas Piping - Evolving Technology & Industry NARUC Annual Meeting Austin, Texas November 8, 2015

2 Flexible Gas Piping Corrugated Stainless Steel Tubing (CSST) Flexible Continuous lengths Jacketed Yellow CSST - insulative Black CSSTs arc protective designs Fittings Field attachable Transition to NPT

3 ANSI Performance Standard - Fuel Gas Piping Systems Using CSST 1983 GRI Residential Gas Piping Program Innovative piping systems Gas competiveness Japanese technology AGA 1-87 Requirements for CSST ANSI LC Harmonized w/ CSA in 1997 ANSI LC 1 /CSA

4 CSST Benefits ~ 75% fewer joints than rigid Productivity Seismic/settling Gas competiveness w/ electric Increased gas utilization

5 Industry Lightning Experience 2003 Frisco, TX 2006 Class action enhanced warnings 2009 NFPA 54 direct bond 2013 GTI report, Bonding Effectiveness 2015 NFPA Public Inputs

6 Industry Safeguards Yellow CSST Installation Safeguards Direct-bond Separation Chase Exclusion Protective Jacketed CSST ICC-ES PMG listing criteria LC1024 (2010) LC1027 (2011)

7 Lightning Test for Protective Jacketed CSST Accredited lightning testing laboratory Lightning generator delivers defined charge to sample Test Charge & Waveform Lightning Generator Electrode CSST Test Sample Ground

8 Lightning Tests and Listings Utilized by the CSST Industry ICC-ES PMG Listing Criteria Parameter LC1024 LC1027 Test Charge (Coulombs) 4.5 C 36 C Min. Peak Current (Amps) 1,000 A 30,000 A Test Charge Basis Assumption of 2 coulomb maximum transient arcing energy w/in building 50 th percentile of negative lightning flashes ground * * Informed from SAE ARP5412B Aerospace Recommended Practice, Aircraft Lightning Environment and Related Test Waveforms

9 Lightning

10 Occurrence Lightning Strikes Magnitude and Frequency Negative Flash to Ground Parameter: Cumulative Charge Transfer 50 th Percentile 50% 50% Cumulative Charge Transfer (Coulombs) Informed from SEA ARP5412B Aerospace Recommended Practice, Aircraft Lightning Environment and Related Test Waveforms Distribution model

11 Industry Tests for Protective Jacketed CSST Sec Indirect Effects 2, Represent 50 th percentile of negative lightning flashes measured at ground LC1027-Lubbock FGS - Lubbock, TX, Fuel Gas Subcommittee and city staff, minimum CSST arc resistance requirement, 8/26/15. 1

12 LC1024-listed CSST Single Layer Conductive Jacketed CSST Semi-conductive polymer layer Spread and dissipate energy 4.5 Coulomb test Black jacket

13 LC1027-listed CSST Metallically Shielded CSST Multi-layer Metallic shield between polymer layers Shield-to-fitting electrical continuity Spread and dissipate energy 36 Coulomb test Black Jacket

14 Industry Reports and Articles Whitepaper (Titeflex) Comparison of Listing Criteria for Protective-Jacketed CSST APGA Source Emerging CSST Products Feature article, July 2015

15 Recent National Press Lawyers, Lightning and Building Codes Public safety Role of litigation in product development Buddy Holly s Hometown Unlikely Pioneer with Lightning and CSST Lubbock, TX, minimum requirement for LC1027-rated CSST

16 ANSI LC 1 CSST Performance Standard Fuel Gas Piping System Using CSST Yellow CSST performance requirements Since 1991 Sec Arc resistant jacket (optional) Since Coulomb (C) electrical arcing test Extreme temperature Resistance to corrosion Resistance to installation damage

17 ANSI LC 1 CSST Performance Standard Recent proposals to ANSI LC 1 performance standard Increase 4.5 C electrical arcing test to 36 C Test in direct contact Add low voltage withstand Proposals have moved to working groups CSA process and maintenance Working groups open to outside experts

18 Public Inputs to NFPA Public CSST Comments 16 Restrictive LC1027 minimum, protective jacket Direct-bonding limits 50-ft max. bond wire length Clamp location 6 separation req t Metal studs exclusion Provide ground fault current path Single layer conductive jacketed Yellow jacket

19 NFPA Can the NFPA 54 Technical Committee rely on higher CSST performance levels into the ANSI LC 1? Gas Associations support for improvements? ANSI LC 1 Test Area Electrical Arcing Withstand Electrode to Test Sample Low Voltage Withstand 2014 LC 1 Working Group 4.5 C 36 C 1/8 air gap Contact with sample No Test Add test for residential current fault

20 A CSST Future More robust performance standard Lightning resistance Low voltage withstand Metallically Shielded or equivalent performing CSST Installation productivity Joint reduction Seismic performance Greater reliability

21 Thank you